/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package com.hp.hpl.jena.clusteredtdb.comms;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;

public class Server implements Runnable
{

    final static int defaultSocket = 3030;
    final static String defaultHost = "localhost"; 
	
    int socket = 0;
    String host = "";
    
	public interface Dispatch
    {
        public void read(SelectionKey key) ;
    }

    private Dispatch dispatch ;

    public Server(Dispatch dispatch)
    {
        this(dispatch, defaultHost, defaultSocket);
    }
    
    public Server(Dispatch dispatch, String host, int socket)
    {
        this.dispatch = dispatch ;
        this.socket = socket;
        this.host = host;        
    }
    
    
    @Override
    public void run()
    {
        server() ;
    }
    
    void server()
    {
        try
        {
            Selector selector = Selector.open() ;
            
            ServerSocketChannel chann = ServerSocketChannel.open() ;    // Listener
            ServerSocket sock = chann.socket() ;
            SocketAddress serverEndpoint = new InetSocketAddress(host,socket) ;
            
            sock.bind(serverEndpoint, 10) ;
            chann.configureBlocking(false) ;
            
            
            SelectionKey key = chann.register(selector, SelectionKey.OP_ACCEPT ) ;
                                                        //SelectionKey.OP_CONNECT |
                                                        //SelectionKey.OP_READ |
                                                        //SelectionKey.OP_WRITE ) ;
            
            while ( true )
            {
                int readyCount = selector.select() ;
                if ( readyCount == 0 )
                    continue ;
                Iterator<SelectionKey> iter = selector.selectedKeys().iterator() ;
                for ( ; iter.hasNext(); )
                {
                    SelectionKey sKey = iter.next();
                    if ( sKey.isAcceptable() )
                    {
                        ServerSocketChannel server = (ServerSocketChannel)key.channel() ;
                        SocketChannel ch = server.accept() ;
                        ch.configureBlocking(false) ;
                        ch.register(selector, SelectionKey.OP_READ) ;
                    }
                    //if ( sKey.isConnectable() ) {}
                    
                    if ( sKey.isReadable() )
                    {
                        dispatch.read(sKey) ;
                        
                    }
                    //else if ( sKey.isWritable() ) {}
                    
                    iter.remove() ;
                }
            }
        } catch (IOException ex)
        {
            ex.printStackTrace();
        }
    }
}

/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
